A betta refusing food is concerning but rarely emergency. Step 1: test water. Ammonia 0, nitrite 0, nitrate under 20. High readings cause appetite loss. Do a 30% water change if any are elevated. Step 2: temperature. Bettas need 78-82°F. A 73°F room-temp "betta bowl" suppresses metabolism + appetite. Add a 25W heater. Step 3: stress. Recent move, new tankmates, lights too bright, water flow too strong. Bettas prefer calm water + dim spots. Step 4: food preference. Many bettas spit out cheap pellets. Try Hikari Betta Bio-Gold, Fluval Bug Bites, frozen bloodworms (thawed), live brine shrimp (best for finicky bettas). Soak pellets 30 seconds before feeding. Step 5: bloating + constipation. If betta has been overfed, fast for 2-3 days, then offer 1 deshelled pea (de-skinned, mashed). Step 6: illness. Velvet (gold dust on body) suppresses appetite. Internal bacterial infection causes pinecone scales (dropsy). Step 7: age. Pet-store bettas are 6-12 months old at purchase; they live 3-5 years total. Older bettas eat less.
The full Q&A library answers the most-searched aquarium questions. Browse calculators, glossary, and disease database for related help.
Whatever specific topic brought you here, four fundamentals govern long-term aquarium success: water quality, parameter stability, biological filtration, and species-appropriate husbandry. Skip any one and the others struggle to compensate.
Water quality: ammonia + nitrite at zero, nitrate under 30 ppm freshwater + 10 ppm reef. Test weekly with API or Salifert kits. Use our water parameter checker to score your readings against your tank type.
Parameter stability: stable wrong parameters beat fluctuating ideal parameters. Most fish tolerate a wide pH range if it's stable. Sudden swings of 0.4+ pH or 5+°F kill fish faster than chronic suboptimal values. Use temperature controllers (Inkbird) + automated dosing for consistency.
Biological filtration: the bacterial colony on your filter media + rock + substrate is the engine. Never replace all media at once. Use our filter turnover calculator to size correctly.
Species-appropriate husbandry: research adult size, territoriality, diet, and tankmate compatibility before purchase. Use our tank stocking calculator + compatibility guides.
How long does an aquarium take to set up? 4-6 weeks for full cycling + first stocking. Use our cycle ETA calculator + how long does cycling take.
What's the best aquarium for beginners? 20-gallon long. Big enough for parameter stability, small enough for budget + space. See beginner picks.
How often should I do water changes? 25-30% weekly. See water change frequency Q&A + water change calculator.
Why does my fish keep dying? 5 leading causes: uncycled tank, wrong species pairings, no quarantine, undersized tank, neglected water-change schedule. See full diagnosis.
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